The device is equipped with a high-speed cellular modem that lets you use the Sprint EVDO network to connect to Amazon’s bookstore. It’s a cinch to search for a book once you order it; you can start reading in about a minute. Because it uses a cellular network, you can do it from almost anywhere, including airport boarding areas and even moving trains. And there is no charge for using the network. Amazon picks up the tab. All you need is an Amazon account which you already have if you’ve bought from them before. That built-in modem also lets you access Web sites but the process is so awkward that it’s almost a non-starter.